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Bosch spark plug question

Fellow Airheads;

I made a purchase ass-backwards. I bought a 4 pack box of Bosch WR7DC spark plugs, then read Snow Bums article and he recommended against using any plug with the "R" letter, meaning it is a resistor or resistance plug, not to be used in airheads. My 1992 RT owners manual recommends Bosch W7DC. Do I now own 4 paperweights? Thoughts please. Thank you!
Denny Pink

Be sure and find the right matching when going to NGK. The temperature rating scheme on the plugs are different. IIRC, Bosch W5 is a colder plug than a W6...reversed on the NGK.

Yes- good point! The numbers do go in opposite directions for the two brands. I think the Bosch W7DC equivalent NGK part number is BP6ES. That said, I see Rick (Motorrad Elektrik) is recommending NGK BP7ES for all 1000cc twins '81 and onward:http://www.motoelekt.com/ignition.htm (scroll to the bottom).

Run the plugs that you've bought. I would be surprised if you had any issues contrary to popular opinion. The 5k resistance isn't going to hurt anything. I can't think of any electronic ignition that is going to be bothered by that small of a resistance level. You'll have more issues with bad wires or bad plug caps than you will have with that small of a resistance. In fact if you are going to go to NGK go to Iridiums. I've used them on point ignition equipped bikes and they work better than the stock plugs.

American BMW owners often seem to STRONGLY resist the following truism:

If you own a German vehicle, they DO NOT have parts for your bike at PepBoys, NAPA, etc. Pretty unlikely at "motorcycle superstore," too.

Now that you own a European vehicle it's time to leave old American ways behind and catch up to your bike. Yes, it's a culture shift.

When your bike was designed, there was ZERO consideration given to whether it could be maintained by typical American DIY methods. You'll have trouble forcing this approach on your bike. Go to Germany some time and see if you can find a PepBoys.

Various importers, including your dealer, are your best bet. Heck, I've ordered tires for my G/S from the UK.

American BMW owners often seem to STRONGLY resist the following truism:

If you own a German vehicle, they DO NOT have parts for your bike at PepBoys, NAPA, etc. Pretty unlikely at "motorcycle superstore," too.

Now that you own a European vehicle it's time to leave old American ways behind and catch up to your bike. Yes, it's a culture shift.

When your bike was designed, there was ZERO consideration given to whether it could be maintained by typical American DIY methods. You'll have trouble forcing this approach on your bike. Go to Germany some time and see if you can find a PepBoys.

Various importers, including your dealer, are your best bet. Heck, I've ordered tires for my G/S from the UK.

Sad truth, you can buy oil, but even most metric BMW bolts are difficult for the American auto parts store.

I made a purchase ass-backwards. I bought a 4 pack box of Bosch WR7DC spark plugs, then read Snow Bums article and he recommended against using any plug with the "R" letter, meaning it is a resistor or resistance plug, not to be used in airheads. My 1992 RT owners manual recommends Bosch W7DC. Do I now own 4 paperweights? Thoughts please. Thank you!
Denny Pink